/// <summary>
/// Process request
/// </summary>
/// <param name="ip">IP</param>
/// <param name="id">ID</param>
/// <param name="seq">Sequence number</param>
/// <param name="data">Packet data</param>
/// <param name="length">Packet length</param>
private static unsafe void EchoReply(byte[] ip, ushort id, ushort seq, byte *data, int length)
{
NetPacketDesc *packet = NetPacket.Alloc();
ICMPHeader *hdr = (ICMPHeader *)(packet->buffer + packet->start);
hdr->Type = TYPE_ECHO_REPLY;
hdr->ID = id;
hdr->SeqNum = seq;
hdr->Code = 0;
hdr->CheckSum = 0;
packet->end += (short)sizeof(ICMPHeader);
Memory.Memcpy(packet->buffer + packet->end, data, length);
packet->end += (short)length;
hdr->CheckSum = NetworkTools.Checksum((byte *)(packet->buffer + packet->start), sizeof(ICMPHeader) + length);
IPV4.Send(packet, ip, 0x01);
NetPacket.Free(packet);
}
/// <summary>
/// Send UDP packet
/// </summary>
/// <param name="packet">Packet structure</param>
/// <param name="destMac">Destination MAC</param>
/// <param name="destIP">Destination IP</param>
/// <param name="srcPort">Source port</param>
/// <param name="DestPort">Destination port</param>
public static unsafe void Send(NetPacketDesc *packet, byte[] destIP, ushort srcPort, ushort DestPort)
{
/**
* No support for packets over 1500 bytes
*/
if (packet->end - packet->start >= 1500)
{
return;
}
addHeader(packet, destIP, srcPort, DestPort);
IPV4.Send(packet, destIP, PROTOCOL_UDP);
}
/// <summary>
/// Send UDP data
/// </summary>
/// <param name="destMac">Destination MAC</param>
/// <param name="destIP">Destination IP</param>
/// <param name="srcPort">Source port</param>
/// <param name="DestPort">Destination port</param>
/// <param name="data">Data pointer</param>
/// <param name="size">Data size</param>
public static unsafe void Send(byte[] destMac, byte[] destIP, ushort srcPort, ushort DestPort, byte[] data, int size)
{
/**
* No support for packets over 1500 bytes
*/
if (size >= 1500)
{
return;
}
NetPacketDesc *packet = NetPacket.Alloc();
Memory.Memcpy(packet->buffer + packet->start, Util.ObjectToVoidPtr(data), size);
addHeader(packet, destIP, srcPort, DestPort);
IPV4.Send(packet, destIP, PROTOCOL_UDP);
NetPacket.Free(packet);
}
/// <summary>
/// Send packet to TCP
/// </summary>
/// <param name="destIP"></param>
/// <param name="seqNum"></param>
/// <param name="acknumb"></param>
/// <param name="srcPort"></param>
/// <param name="destPort"></param>
/// <param name="flags"></param>
/// <param name="data"></param>
/// <param name="count"></param>
/// <returns></returns>
private static unsafe bool SendPacket(byte[] destIP, uint seqNum, uint acknumb, ushort srcPort, ushort destPort, byte flags, byte *data, int count)
{
NetPacketDesc *packet = NetPacket.Alloc();
if (count > 0)
{
Memory.Memcpy(packet->buffer + packet->start, data, count);
packet->end += (short)count;
}
TCPHeader *outHeader = addHeader(packet, srcPort, destPort, flags, seqNum, acknumb, 8192);
FinishHeader(packet, outHeader, destIP, sizeof(TCPHeader), count);
IPV4.Send(packet, destIP, PROTOCOL_TCP);
NetPacket.Free(packet);
return(true);
}